Stefanie Nation and Shannon O'Keefe defeated Missy Parkin and Kelly Kulick in an all-Team USA battle for the doubles gold medal Thursday at the 2013 World Tenpin Bowling Association World Championships, the United States Bowling Congress reported. Nation and O'Keefe built a 30-pin lead in the title match and secured a 482-438 win when O'Keefe struck in the final frame. Nation fired a 258, O'Keefe 224, Kulick 245, and Parkin 193 in the competition at Sunset Station's Strike Zone Bowling...